Automatic choking device



Dec. 31, 1935. c w, o s

AUTOMATIC CHOKING DEVICE Filed. May 24, 1954 INVENTOR' WHCPG-S, ia? ATTORNEYS n4 4- ////A M .3 um n hfinwnul/ a, Ill/"fir 1 l? n MW i M 512M B w 2 C I V 1 z y 4 E WITNESS Patented Dec. 31, 1935 UNITED STATES PATENT OFFHCE AUTOMATIC CHOKING DEVICE Charles W. Hopes, Miami, Fla.

Application May {84, 1934, Serial No. 727,333

3 Claims.

matically cut out when the engine has been started.

A further object of the invention is the provision of an attachment to the air intake pipe of a carburetor in which a normally closed valve is 15 opened when the starting switch is closed for supplying gasoline directly to the intake manifold after the greater portion of the air has been cut off from the said intake manifold. The atta'chment is further provided with an annular channel 20 for receiving a supply of gasoline and with inclined air passages for conducting air directly over the surface of the gasoline in the channel after which the mixture is conducted directly to the engine. Means is also employed for permit- 25 ting the valve to be closed when the engine has been started.

This invention will be best understood from a consideration of the following detailed description, in view of the accompanying drawing form- 30 ing a part of the specification; nevertheless, it

is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications as define'no'material departure from the salient features of the inven- 35 tion as expressed in the appended claims. In the drawing: Figure 1 is a side view partly in section of a device constructed in accordance with the principles of the invention, 40 Figure 2 is a fragmentary horizontalsection taken along the line 2-2 of Figure 1, and

Figure 3 is a wiring diagram of the electric circuit.

Referring more particularly to the drawing, 45 the numeral l0 designates a carbureter of the usual type having a fuel mixture intake pipe II directly connected with the intake manifold of an engine (not shown) which fuel mixture intake pipe is provided with a throttle valve oper- 50 ated by a crank arm l2. An air intake pipe I3 is provided for supplying air to the mixing chamber of the carbureter l0.

An air conduit l5 has a flanged connection at [6 with the air intake pipe l3. This conduit is 55 curved, as shown in Fig. 2, and opens at I! into a chamber I8 in a housing It. The bottom of the housing is closed,'as shown at 20, and said housing is provided with a sloping top portion H from which projects an integrally formed boss 22. 5

A solenoid 25 is located within a brass sleeve 26 which is screwed at 21 into the flanged portion 28 of the boss 22.

A core 30 is mounted for sliding movement in the solenoid 26 and is maintained in an inoperative position by means of a spring 3| and this spring is maintained under a predetermined pressure. by a screw 32 threaded into a boss 33 located axially of a top 34 for the brass tubing or sleeve 26.

The lower end of the core is in the form of a conically-shaped valve .35 which rests upon a similarly formed seat 36.

A stem 31 projects from the valve and has a reduced portion 38 movable through an opening 39 at the lower end of the seat 36 and in the top portion 2| of the housing l9. It will be seen that when the' core 30 is raised and likewise the valve 35 from its seat 36, the reduced portion 38 of the stem will permit gasoline to flow through the opening 39 as will be presently explained.

The lower end of the stem 31 passes through an opening 40 and neatly fits said opening. A disc 4! is secured to the lower end of the stem and externally of the housing IS. The upper face of the disc is fiat and neatly engages the flat outer surface of the portion 20 of the housing IS.

The bottom portion of the housing is provided with a plurality of vertically disposed air passages 42 arranged concentrically with respect to the passage 40 and these air passages are maintained in an open condition, as shown in Fig, 1, during the normal operation of the engine.

The bottom 20 of the housing 59 and within the chamber 18 is provided with an annular channel 45 which surrounds the centrally disposed boss 46 located at the inner surface of the bottom portion 20.

A plurality of diagonally disposed air passages 67 are formed in the side walls of the housing I!) and in a series around the cylindrical housing with the lower ends of the passages entering the channel 65 while the upper ends of the passages are in communication with the atmosphere. The inner face of the top 21 of the housing [9 is conically-shaped, as shown at 50, to provide an in- 50 clined surface for draining the gasoline from the passage 39 downwardly along the vertical side walls of the chamber 18 and into the annular channel 35.

The boss where it is connected to the top 21 is providedwith a boss which has an internally threaded passage 52 to receive a securing plug 53 for a gasoline pipe 55. A gasoline channel 56 extends from the inner end of the threaded pasi circuit to the solenoid 25 is closed through wires 68, 69, and 12 and the core 36 is moved outwardly against the tension of a spring 3| whereby the valve 35 is opened and gasoline is permitted to flow through the passage 56, through the passage 39, and drained downwardly along the inclined wall 50 of the top portion 2| and down the vertical side walls of the chamber I8 and into the annular channel 45. Since the opening of the valve 35 is caused by the outward movement of the solenoid 30, the disc 4| is moved upwardly to close the air passages 42 to the chamber l8 so that the only air entering said chamber will be through the inclined air passages 41. This air being drawn over the surface of the gasoline in the channel 45 will be thoroughly saturated with gasoline to form a mixture which will be carried directly through intakes l5, l3, and ,II to the engine.

As soon as the engine begins to operate under its own power and the generator is supplying current to the battery ll the switch 65 is opened, thereby breaking the circuit to the solenoid 26 so that the spring 3| will move the core 30 inwardly and force the valve 35 in snugcontact with its seat 36 to cut off the auxiliary supply of gasoline from the passage 56.

As soon as the core 30 is acted upon by the spring 3| the stem 31 will move the disc 4| away from the outer ends of the air passages 42 so that the regular air supply to the engine will be had through the passages 42 and the passages 47.

Where the engine is warm and starts immediately the automatic operation of the choking device Will only be momentarily so that there will be no unnecessary supply of gasoline to the engine.

While I have shown the device as being automatically operated by a solenoid, the same may also be set in operation by a series of links and levers.

I claim:

1. An automatic choking device for internal combustion engines comprising a housing provided with an annular channel in the bottom thereof to receive a liquid fuel, the side walls of the housing having inclined air passages connecting the channel with the atmosphere, the bottom of the housing having a raised boss embraced by the channel and provided with a plurality of air passages connecting the interior of 5 the housing with the atmosphere, a disc adapted to close the last-mentioned passages, a stem connected to the disc, a core provided with avalve member, the housing having a fuel passage closed by the valve member, a solenoid for reciprocating 10 the core to open the valve and move the disc into closing relation with the air passages in the boss, and means for causing energization of the solenoid.

2; An automatic choking device for internal combustion engines comprising a housing having a bottom portion provided with an annular channel, the outer wall of which is common with the inner side wall of the housing, the inner wall of the top portion being inclined, the central portion being provided with an opening, means for feeding gasoline through the opening so that the gasoline will drain downwardly on the inclined wall and side wall of the housing into the annular channel, said side wall having inclined air passages connecting the channel with the atmosphere, the portion of the bottom embraced by the channel. being elevated above the channel and provided with air passages, a disc for closing said passages, a valve member for controlling the admission of gasoline to the housing, and means for moving the valve member to open position and the disc to closing position. 1

3. An automatic choking device for internal combustion engines comprising a housing having a bottom portion provided with an annular channel, the outer wallof which is common with the inner side wall of the housing, the inner wall of the top portion being inclined, the central portion being provided with an opening, means for 40 feeding gasoline through the opening so that the gasoline will drain downwardly on the inclined wall and side wall of the housing into the annular channel, said side wall having inclined air passages connecting the channel with the atmosphere, the portion of the bottom embraced by the channel being elevated above the channel and provided with air passages, a disc for controlling said passages, a valve member for controlling the admission of gasoline to the housing, a stem connecting the valve member and disc and having a reduced portion passing through the opening in the top, a solenoid, and means controlled by the solenoid when energized for moving the valve member to closing position with respect to the adjacently disposed air passages.

CHARLES W. HOPES. 

